CN116148972A

CN116148972A - Node-free anti-resonance hollow fiber based on negative curvature jacket medium tube

Info

Publication number: CN116148972A
Application number: CN202310018586.3A
Authority: CN
Inventors: 柯强; 左翔宇; 祝远锋; 张鹏
Original assignee: Jiangxi Normal University
Current assignee: Jiangxi Normal University
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-05-23

Abstract

The invention discloses a node-free antiresonance hollow fiber based on a negative curvature outer sleeve medium tube, which comprises a first type medium tube, a second type medium tube and a first type outer sleeve medium tube, wherein the first type medium tube is fixed on the arc-shaped inner wall of the first type outer sleeve medium tube in an external cutting mode, the first type medium tube is fixedly connected with the second type medium tube in an internal cutting mode, the tangent point is positioned at the same position with the connecting point of the first type medium tube and the first type outer sleeve medium tube, and no node exists between the second type medium tube. The invention adopts the node-free anti-resonance hollow fiber based on the negative curvature jacket dielectric tube, the fiber core has a negative curvature boundary, the outer sleeve has a negative curvature boundary, the fiber has a plurality of anti-resonance layers, the fiber cladding has no nodes, no loss peak value caused by transverse nodes is avoided, the limiting loss is effectively reduced, and the transmission bandwidth is increased.

Description

Node-free anti-resonance hollow fiber based on negative curvature jacket medium tube

Technical Field

The invention relates to the technical field of optical fibers, in particular to a node-free antiresonant hollow optical fiber based on a negative-curvature jacket dielectric tube.

Background

The optical fiber technology is widely applied in national economy development, relates to a plurality of fields such as industrial manufacture, information communication technology, medical safety, aerospace, laser transmission and the like, and is an indispensable part of new construction and space-earth integrated construction. After the 21 st century, with explosive increase of data transmission capacity, continuous improvement of optical fiber laser power, urgent application requirement of complex sensing array in extreme environment, etc., quartz as optical fiber material has physical intrinsic defect which is gradually highlighted, and becomes bottleneck which is difficult to break through by traditional solid fiber, so that the existing optical fiber technology industry is in dilemma for a first time, and the internet is about to face optical capacity crisis.

In contrast, hollow core fibers confine light at the air core rather than in a conventional doped silicon core, which can completely free up material limitations in fiber technology applications. Because of the natural excellent optical performance in terms of broadband transmission, laser damage threshold, transmission rate and single-mode property, hollow fiber is developed in blowout in recent years, becomes the forefront of the current world optical fiber research hot spot, and provides an important driving force for the development of the fields of optical fiber communication, high-energy laser transmission, sensing, ultra-fast optics and the like.

Researchers hope to reduce the manufacturing difficulty while reducing the loss of antiresonant hollow-core fibers, and to limit the leakage of optical transmission by employing a single antiresonant layer, F.Yu et al [ F.Yu, W.J.Wadsworth, andJ.C.Knight, lowloss silica core for3-4 mu ms peak region [ J ]. Opt. Express,2012,20 (10): 11153-11158 ] propose a single-resonator negative-curvature antiresonant hollow-core fiber that is structurally simplified compared to a Kagome cladding-structured hollow-core fiber, but has nodes and only one antiresonant layer that result in insufficiently low loss. It was then found that nested circular dielectric tubes could be added to the antiresonant unit, resulting in a significant reduction in losses. W.J. Belladi [ W.Belladi, designandpropertiesofhollowantiresonantfibersforthevisibleand nearinfraredspectralrange [ J ]. J.Lightw.Technol,2015, 32:4497-4503 ] successfully prepared a nested hollow fiber with large thickness differences between dielectric tubes, and a large number of antiresonant units, and it was difficult to precisely control the size and position of each nested dielectric tube. Wang, beijing university of industry et al [ Shou-feiGao, ying-yingWang, weiDing, et al, hollow-core-coupled-tube-splice-resonant cavity, nat. Commun,2018,9 (1) ] published a multi-resonant layer anti-resonant hollow-core fiber with cladding nodes, known as a monolithic hollow-core fiber. During the fabrication process, the locations of the nodes in the cladding need to be arranged relatively precisely to minimize their negative impact on fiber loss. Amrani et al [ F.Amrani, J.H.Os (rio), F.Delahaye, et al, low-loss-mode hybrid-laser-core photo-crystal fiber [ J ]. Light: science & applications,2021,10 (1) ] propose a hybrid lattice hollow-core photonic crystal fiber which has very large loss ripple and very narrow bandwidth due to loss peaks. Therefore, research and development of a low-loss, high-bandwidth hollow fiber with easy preparation and no cladding nodes are needed.

Disclosure of Invention

The invention aims to provide a node-free anti-resonance hollow fiber based on a negative curvature jacket medium tube, wherein the fiber core has a negative curvature boundary, the outer sleeve has a negative curvature boundary, the fiber has a plurality of anti-resonance layers, the fiber cladding has no nodes, no loss peak value caused by transverse nodes is avoided, the limiting loss is effectively reduced, and the transmission bandwidth is increased.

In order to achieve the above purpose, the invention provides a node-free antiresonance hollow fiber based on a negative curvature jacket medium tube, which comprises a first type medium tube, a second type medium tube and a first type jacket medium tube, wherein the first type medium tube is fixed on the arc-shaped inner wall of the first type jacket medium tube in a circumscribed manner, the first type medium tube is fixedly connected with the second type medium tube in an inscribed manner, the tangent point is positioned at the same position as the connecting point of the first type medium tube and the first type jacket medium tube, and no node exists between the second type medium tubes.

Preferably, the area surrounded by the outer wall of the first type of medium tube forms a first type of hole, namely a fiber core area, the area between the first type of medium tube and the first type of outer sleeve medium tube is a second type of hole, the area inside the second type of medium tube is a third type of hole, and the area between the first type of medium tube and the second type of medium tube is a fourth type of hole.

Preferably, the first type of jacket medium tube is a negative curvature inner boundary.

Preferably, the number of the first type medium pipes is 4, 5 or 6.

Preferably, the optical fiber is made of any one of silicon dioxide, soft glass or plastic.

Therefore, the node-free anti-resonance hollow optical fiber based on the negative curvature jacket medium tube is adopted, the optical fiber core has a negative curvature boundary, the outer sleeve has a negative curvature boundary, the optical fiber has a plurality of anti-resonance layers, the optical fiber cladding has no nodes, no loss peak value caused by transverse nodes is avoided, the limiting loss is effectively reduced, and the transmission bandwidth is increased.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

FIG. 1 is a schematic diagram of an anti-resonant hollow-core fiber of example 1 of a node-less anti-resonant hollow-core fiber based on a negative curvature jacket dielectric tube according to the present invention;

FIG. 2 is a schematic diagram of an anti-resonant hollow-core fiber of example 2 of a node-less anti-resonant hollow-core fiber based on a negative curvature jacket dielectric tube according to the present invention;

FIG. 3 is a schematic diagram of an anti-resonant hollow-core fiber of example 3 of a node-less anti-resonant hollow-core fiber based on a negative curvature jacket dielectric tube according to the present invention.

Reference numerals

1. A first type of media tube; 2. a second type of media tube; 3. a first type of jacket media tube; 4. a first type of aperture; 5. a second type of aperture; 6. a third type of aperture; 7. and a fourth type of well.

Detailed Description

The technical scheme of the invention is further described below through the attached drawings and the embodiments.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

Example 1

The invention provides an antiresonance hollow fiber based on a negative curvature jacket medium tube, which is shown in figure 1, and consists of a first type medium tube 1, a second type medium tube 2 and a first type jacket medium tube 3, wherein the first type jacket medium tube 3 has a negative curvature boundary. The first-type medium tube 1 is fixed on the inner wall of the first-type outer sleeve medium tube 3 in a circumscribed mode, so that the position of the optical fiber is not easy to change.

The first type medium tube 1 and the second type medium tube 2 are connected in an inscribing way, the tangent point is positioned at the same position as the connecting point of the first type medium tube 1 and the first type outer sleeve medium tube 3, and no node exists between the second type medium tubes 2, so that the loss is reduced, and the transmission bandwidth is increased. The region surrounded by the outer wall of the first-type dielectric tube 1 forms a first-type hole 4, namely a fiber core region, wherein the fiber core region is a central region with higher refractive index of transmitted light than that of an adjacent region in the optical waveguide, and the fiber core region enables optical signals to be transmitted in the region. The area between the first-type medium pipe 1 and the first-type outer sleeve medium pipe 3 is a second-type hole 5, the area in the second-type medium pipe 2 is a third-type hole 6, and the area between the first-type medium pipe 1 and the second-type medium pipe 2 is a fourth-type hole 7.

The first type of jacket medium tube 3 is a negative curvature boundary and the second type of holes 5 is an air region. The number of the first type medium pipes 1 is 6; the optical fiber is made of any one of silicon dioxide, soft glass or plastic.

At a wavelength of 1.06 μm, the outer diameter of the first type dielectric tube 1 is 14 μm, the outer diameter of the second type dielectric tube 2 is 5.6 μm, the thicknesses of all the dielectric tubes are 0.42 μm, the limiting loss of the fundamental mode obtained by numerical simulation is 0.15dB/km, and the distribution ratio of the mode energy in the air is 99.992%. The limiting loss of the fiber core fundamental mode can be as low as 0.072dB/km in the near infrared band, the operating wavelength is within the wave band of 0.972-1.653 mu m, the limiting loss of the fiber core fundamental mode can be lower than 1dB/km, and the bandwidth is 681nm.

Example two

The invention provides an antiresonant hollow fiber based on a negative curvature jacket dielectric tube, as shown in fig. 2, the number of first-type dielectric tubes 1 is 5, and other embodiments are the same.

Because the number of the first-type medium pipes 1 is different, the data such as the outer diameter of the first-type medium pipes are correspondingly different, and the corresponding data is obtained by performing simulation by using COMSOL software.

Example III

The invention provides an antiresonant hollow fiber based on a negative curvature jacket dielectric tube, as shown in fig. 3, the number of first type dielectric tubes 1 is 4, and other embodiments are the same.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.

Claims

1. The utility model provides a no node antiresonance hollow fiber based on negative curvature overcoat medium pipe which characterized in that: the novel medium tube comprises a first type medium tube, a second type medium tube and a first type outer sleeve medium tube, wherein the first type medium tube is fixed on the arc-shaped inner wall of the first type outer sleeve medium tube in an circumscribed mode, the first type medium tube is fixedly connected with the second type medium tube in an inscribed mode, the tangent point is positioned at the same position as the connecting point of the first type medium tube and the first type outer sleeve medium tube, and no node exists between the second type medium tubes.

2. A node-less antiresonant hollow core optical fiber based on a negative curvature jacket dielectric tube as claimed in claim 1, wherein: the area surrounded by the outer wall of the first-type medium tube forms a first-type hole, namely a fiber core area, the area between the first-type medium tube and the first-type outer sleeve medium tube is a second-type hole, the inner area of the second-type medium tube is a third-type hole, and the area between the first-type medium tube and the second-type medium tube is a fourth-type hole.

3. A node-less antiresonant hollow core optical fiber based on a negative curvature jacket dielectric tube as claimed in claim 1, wherein: the first type of jacket medium tube is a negative curvature inner boundary.

4. A node-less antiresonant hollow core optical fiber based on a negative curvature jacket dielectric tube as claimed in claim 1, wherein: the number of the first type medium pipes is 4, 5 or 6.

5. A node-less antiresonant hollow core optical fiber based on a negative curvature jacket dielectric tube as claimed in claim 2, wherein: the optical fiber is made of any one of silicon dioxide, soft glass or plastic.